1 /* 2 BlueZ - Bluetooth protocol stack for Linux 3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved. 4 5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License version 2 as 9 published by the Free Software Foundation; 10 11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 22 SOFTWARE IS DISCLAIMED. 23 */ 24 25 /* Bluetooth HCI connection handling. */ 26 27 #include <linux/export.h> 28 #include <linux/debugfs.h> 29 30 #include <net/bluetooth/bluetooth.h> 31 #include <net/bluetooth/hci_core.h> 32 #include <net/bluetooth/l2cap.h> 33 34 #include "hci_request.h" 35 #include "smp.h" 36 #include "a2mp.h" 37 38 struct sco_param { 39 u16 pkt_type; 40 u16 max_latency; 41 u8 retrans_effort; 42 }; 43 44 static const struct sco_param esco_param_cvsd[] = { 45 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */ 46 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */ 47 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */ 48 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */ 49 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */ 50 }; 51 52 static const struct sco_param sco_param_cvsd[] = { 53 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */ 54 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */ 55 }; 56 57 static const struct sco_param esco_param_msbc[] = { 58 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */ 59 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */ 60 }; 61 62 /* This function requires the caller holds hdev->lock */ 63 static void hci_connect_le_scan_cleanup(struct hci_conn *conn) 64 { 65 struct hci_conn_params *params; 66 struct hci_dev *hdev = conn->hdev; 67 struct smp_irk *irk; 68 bdaddr_t *bdaddr; 69 u8 bdaddr_type; 70 71 bdaddr = &conn->dst; 72 bdaddr_type = conn->dst_type; 73 74 /* Check if we need to convert to identity address */ 75 irk = hci_get_irk(hdev, bdaddr, bdaddr_type); 76 if (irk) { 77 bdaddr = &irk->bdaddr; 78 bdaddr_type = irk->addr_type; 79 } 80 81 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr, 82 bdaddr_type); 83 if (!params || !params->explicit_connect) 84 return; 85 86 /* The connection attempt was doing scan for new RPA, and is 87 * in scan phase. If params are not associated with any other 88 * autoconnect action, remove them completely. If they are, just unmark 89 * them as waiting for connection, by clearing explicit_connect field. 90 */ 91 params->explicit_connect = false; 92 93 list_del_init(¶ms->action); 94 95 switch (params->auto_connect) { 96 case HCI_AUTO_CONN_EXPLICIT: 97 hci_conn_params_del(hdev, bdaddr, bdaddr_type); 98 /* return instead of break to avoid duplicate scan update */ 99 return; 100 case HCI_AUTO_CONN_DIRECT: 101 case HCI_AUTO_CONN_ALWAYS: 102 list_add(¶ms->action, &hdev->pend_le_conns); 103 break; 104 case HCI_AUTO_CONN_REPORT: 105 list_add(¶ms->action, &hdev->pend_le_reports); 106 break; 107 default: 108 break; 109 } 110 111 hci_update_passive_scan(hdev); 112 } 113 114 static void hci_conn_cleanup(struct hci_conn *conn) 115 { 116 struct hci_dev *hdev = conn->hdev; 117 118 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags)) 119 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type); 120 121 hci_chan_list_flush(conn); 122 123 hci_conn_hash_del(hdev, conn); 124 125 if (conn->type == SCO_LINK || conn->type == ESCO_LINK) { 126 switch (conn->setting & SCO_AIRMODE_MASK) { 127 case SCO_AIRMODE_CVSD: 128 case SCO_AIRMODE_TRANSP: 129 if (hdev->notify) 130 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO); 131 break; 132 } 133 } else { 134 if (hdev->notify) 135 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL); 136 } 137 138 hci_conn_del_sysfs(conn); 139 140 debugfs_remove_recursive(conn->debugfs); 141 142 hci_dev_put(hdev); 143 144 hci_conn_put(conn); 145 } 146 147 static void le_scan_cleanup(struct work_struct *work) 148 { 149 struct hci_conn *conn = container_of(work, struct hci_conn, 150 le_scan_cleanup); 151 struct hci_dev *hdev = conn->hdev; 152 struct hci_conn *c = NULL; 153 154 BT_DBG("%s hcon %p", hdev->name, conn); 155 156 hci_dev_lock(hdev); 157 158 /* Check that the hci_conn is still around */ 159 rcu_read_lock(); 160 list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) { 161 if (c == conn) 162 break; 163 } 164 rcu_read_unlock(); 165 166 if (c == conn) { 167 hci_connect_le_scan_cleanup(conn); 168 hci_conn_cleanup(conn); 169 } 170 171 hci_dev_unlock(hdev); 172 hci_dev_put(hdev); 173 hci_conn_put(conn); 174 } 175 176 static void hci_connect_le_scan_remove(struct hci_conn *conn) 177 { 178 BT_DBG("%s hcon %p", conn->hdev->name, conn); 179 180 /* We can't call hci_conn_del/hci_conn_cleanup here since that 181 * could deadlock with another hci_conn_del() call that's holding 182 * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work). 183 * Instead, grab temporary extra references to the hci_dev and 184 * hci_conn and perform the necessary cleanup in a separate work 185 * callback. 186 */ 187 188 hci_dev_hold(conn->hdev); 189 hci_conn_get(conn); 190 191 /* Even though we hold a reference to the hdev, many other 192 * things might get cleaned up meanwhile, including the hdev's 193 * own workqueue, so we can't use that for scheduling. 194 */ 195 schedule_work(&conn->le_scan_cleanup); 196 } 197 198 static void hci_acl_create_connection(struct hci_conn *conn) 199 { 200 struct hci_dev *hdev = conn->hdev; 201 struct inquiry_entry *ie; 202 struct hci_cp_create_conn cp; 203 204 BT_DBG("hcon %p", conn); 205 206 /* Many controllers disallow HCI Create Connection while it is doing 207 * HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create 208 * Connection. This may cause the MGMT discovering state to become false 209 * without user space's request but it is okay since the MGMT Discovery 210 * APIs do not promise that discovery should be done forever. Instead, 211 * the user space monitors the status of MGMT discovering and it may 212 * request for discovery again when this flag becomes false. 213 */ 214 if (test_bit(HCI_INQUIRY, &hdev->flags)) { 215 /* Put this connection to "pending" state so that it will be 216 * executed after the inquiry cancel command complete event. 217 */ 218 conn->state = BT_CONNECT2; 219 hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL); 220 return; 221 } 222 223 conn->state = BT_CONNECT; 224 conn->out = true; 225 conn->role = HCI_ROLE_MASTER; 226 227 conn->attempt++; 228 229 conn->link_policy = hdev->link_policy; 230 231 memset(&cp, 0, sizeof(cp)); 232 bacpy(&cp.bdaddr, &conn->dst); 233 cp.pscan_rep_mode = 0x02; 234 235 ie = hci_inquiry_cache_lookup(hdev, &conn->dst); 236 if (ie) { 237 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) { 238 cp.pscan_rep_mode = ie->data.pscan_rep_mode; 239 cp.pscan_mode = ie->data.pscan_mode; 240 cp.clock_offset = ie->data.clock_offset | 241 cpu_to_le16(0x8000); 242 } 243 244 memcpy(conn->dev_class, ie->data.dev_class, 3); 245 } 246 247 cp.pkt_type = cpu_to_le16(conn->pkt_type); 248 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER)) 249 cp.role_switch = 0x01; 250 else 251 cp.role_switch = 0x00; 252 253 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp); 254 } 255 256 int hci_disconnect(struct hci_conn *conn, __u8 reason) 257 { 258 BT_DBG("hcon %p", conn); 259 260 /* When we are central of an established connection and it enters 261 * the disconnect timeout, then go ahead and try to read the 262 * current clock offset. Processing of the result is done 263 * within the event handling and hci_clock_offset_evt function. 264 */ 265 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER && 266 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) { 267 struct hci_dev *hdev = conn->hdev; 268 struct hci_cp_read_clock_offset clkoff_cp; 269 270 clkoff_cp.handle = cpu_to_le16(conn->handle); 271 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp), 272 &clkoff_cp); 273 } 274 275 return hci_abort_conn(conn, reason); 276 } 277 278 static void hci_add_sco(struct hci_conn *conn, __u16 handle) 279 { 280 struct hci_dev *hdev = conn->hdev; 281 struct hci_cp_add_sco cp; 282 283 BT_DBG("hcon %p", conn); 284 285 conn->state = BT_CONNECT; 286 conn->out = true; 287 288 conn->attempt++; 289 290 cp.handle = cpu_to_le16(handle); 291 cp.pkt_type = cpu_to_le16(conn->pkt_type); 292 293 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp); 294 } 295 296 static bool find_next_esco_param(struct hci_conn *conn, 297 const struct sco_param *esco_param, int size) 298 { 299 for (; conn->attempt <= size; conn->attempt++) { 300 if (lmp_esco_2m_capable(conn->link) || 301 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3)) 302 break; 303 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported", 304 conn, conn->attempt); 305 } 306 307 return conn->attempt <= size; 308 } 309 310 static bool hci_enhanced_setup_sync_conn(struct hci_conn *conn, __u16 handle) 311 { 312 struct hci_dev *hdev = conn->hdev; 313 struct hci_cp_enhanced_setup_sync_conn cp; 314 const struct sco_param *param; 315 316 bt_dev_dbg(hdev, "hcon %p", conn); 317 318 /* for offload use case, codec needs to configured before opening SCO */ 319 if (conn->codec.data_path) 320 hci_req_configure_datapath(hdev, &conn->codec); 321 322 conn->state = BT_CONNECT; 323 conn->out = true; 324 325 conn->attempt++; 326 327 memset(&cp, 0x00, sizeof(cp)); 328 329 cp.handle = cpu_to_le16(handle); 330 331 cp.tx_bandwidth = cpu_to_le32(0x00001f40); 332 cp.rx_bandwidth = cpu_to_le32(0x00001f40); 333 334 switch (conn->codec.id) { 335 case BT_CODEC_MSBC: 336 if (!find_next_esco_param(conn, esco_param_msbc, 337 ARRAY_SIZE(esco_param_msbc))) 338 return false; 339 340 param = &esco_param_msbc[conn->attempt - 1]; 341 cp.tx_coding_format.id = 0x05; 342 cp.rx_coding_format.id = 0x05; 343 cp.tx_codec_frame_size = __cpu_to_le16(60); 344 cp.rx_codec_frame_size = __cpu_to_le16(60); 345 cp.in_bandwidth = __cpu_to_le32(32000); 346 cp.out_bandwidth = __cpu_to_le32(32000); 347 cp.in_coding_format.id = 0x04; 348 cp.out_coding_format.id = 0x04; 349 cp.in_coded_data_size = __cpu_to_le16(16); 350 cp.out_coded_data_size = __cpu_to_le16(16); 351 cp.in_pcm_data_format = 2; 352 cp.out_pcm_data_format = 2; 353 cp.in_pcm_sample_payload_msb_pos = 0; 354 cp.out_pcm_sample_payload_msb_pos = 0; 355 cp.in_data_path = conn->codec.data_path; 356 cp.out_data_path = conn->codec.data_path; 357 cp.in_transport_unit_size = 1; 358 cp.out_transport_unit_size = 1; 359 break; 360 361 case BT_CODEC_TRANSPARENT: 362 if (!find_next_esco_param(conn, esco_param_msbc, 363 ARRAY_SIZE(esco_param_msbc))) 364 return false; 365 param = &esco_param_msbc[conn->attempt - 1]; 366 cp.tx_coding_format.id = 0x03; 367 cp.rx_coding_format.id = 0x03; 368 cp.tx_codec_frame_size = __cpu_to_le16(60); 369 cp.rx_codec_frame_size = __cpu_to_le16(60); 370 cp.in_bandwidth = __cpu_to_le32(0x1f40); 371 cp.out_bandwidth = __cpu_to_le32(0x1f40); 372 cp.in_coding_format.id = 0x03; 373 cp.out_coding_format.id = 0x03; 374 cp.in_coded_data_size = __cpu_to_le16(16); 375 cp.out_coded_data_size = __cpu_to_le16(16); 376 cp.in_pcm_data_format = 2; 377 cp.out_pcm_data_format = 2; 378 cp.in_pcm_sample_payload_msb_pos = 0; 379 cp.out_pcm_sample_payload_msb_pos = 0; 380 cp.in_data_path = conn->codec.data_path; 381 cp.out_data_path = conn->codec.data_path; 382 cp.in_transport_unit_size = 1; 383 cp.out_transport_unit_size = 1; 384 break; 385 386 case BT_CODEC_CVSD: 387 if (lmp_esco_capable(conn->link)) { 388 if (!find_next_esco_param(conn, esco_param_cvsd, 389 ARRAY_SIZE(esco_param_cvsd))) 390 return false; 391 param = &esco_param_cvsd[conn->attempt - 1]; 392 } else { 393 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd)) 394 return false; 395 param = &sco_param_cvsd[conn->attempt - 1]; 396 } 397 cp.tx_coding_format.id = 2; 398 cp.rx_coding_format.id = 2; 399 cp.tx_codec_frame_size = __cpu_to_le16(60); 400 cp.rx_codec_frame_size = __cpu_to_le16(60); 401 cp.in_bandwidth = __cpu_to_le32(16000); 402 cp.out_bandwidth = __cpu_to_le32(16000); 403 cp.in_coding_format.id = 4; 404 cp.out_coding_format.id = 4; 405 cp.in_coded_data_size = __cpu_to_le16(16); 406 cp.out_coded_data_size = __cpu_to_le16(16); 407 cp.in_pcm_data_format = 2; 408 cp.out_pcm_data_format = 2; 409 cp.in_pcm_sample_payload_msb_pos = 0; 410 cp.out_pcm_sample_payload_msb_pos = 0; 411 cp.in_data_path = conn->codec.data_path; 412 cp.out_data_path = conn->codec.data_path; 413 cp.in_transport_unit_size = 16; 414 cp.out_transport_unit_size = 16; 415 break; 416 default: 417 return false; 418 } 419 420 cp.retrans_effort = param->retrans_effort; 421 cp.pkt_type = __cpu_to_le16(param->pkt_type); 422 cp.max_latency = __cpu_to_le16(param->max_latency); 423 424 if (hci_send_cmd(hdev, HCI_OP_ENHANCED_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0) 425 return false; 426 427 return true; 428 } 429 430 static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle) 431 { 432 struct hci_dev *hdev = conn->hdev; 433 struct hci_cp_setup_sync_conn cp; 434 const struct sco_param *param; 435 436 bt_dev_dbg(hdev, "hcon %p", conn); 437 438 conn->state = BT_CONNECT; 439 conn->out = true; 440 441 conn->attempt++; 442 443 cp.handle = cpu_to_le16(handle); 444 445 cp.tx_bandwidth = cpu_to_le32(0x00001f40); 446 cp.rx_bandwidth = cpu_to_le32(0x00001f40); 447 cp.voice_setting = cpu_to_le16(conn->setting); 448 449 switch (conn->setting & SCO_AIRMODE_MASK) { 450 case SCO_AIRMODE_TRANSP: 451 if (!find_next_esco_param(conn, esco_param_msbc, 452 ARRAY_SIZE(esco_param_msbc))) 453 return false; 454 param = &esco_param_msbc[conn->attempt - 1]; 455 break; 456 case SCO_AIRMODE_CVSD: 457 if (lmp_esco_capable(conn->link)) { 458 if (!find_next_esco_param(conn, esco_param_cvsd, 459 ARRAY_SIZE(esco_param_cvsd))) 460 return false; 461 param = &esco_param_cvsd[conn->attempt - 1]; 462 } else { 463 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd)) 464 return false; 465 param = &sco_param_cvsd[conn->attempt - 1]; 466 } 467 break; 468 default: 469 return false; 470 } 471 472 cp.retrans_effort = param->retrans_effort; 473 cp.pkt_type = __cpu_to_le16(param->pkt_type); 474 cp.max_latency = __cpu_to_le16(param->max_latency); 475 476 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0) 477 return false; 478 479 return true; 480 } 481 482 bool hci_setup_sync(struct hci_conn *conn, __u16 handle) 483 { 484 if (enhanced_sco_capable(conn->hdev)) 485 return hci_enhanced_setup_sync_conn(conn, handle); 486 487 return hci_setup_sync_conn(conn, handle); 488 } 489 490 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency, 491 u16 to_multiplier) 492 { 493 struct hci_dev *hdev = conn->hdev; 494 struct hci_conn_params *params; 495 struct hci_cp_le_conn_update cp; 496 497 hci_dev_lock(hdev); 498 499 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type); 500 if (params) { 501 params->conn_min_interval = min; 502 params->conn_max_interval = max; 503 params->conn_latency = latency; 504 params->supervision_timeout = to_multiplier; 505 } 506 507 hci_dev_unlock(hdev); 508 509 memset(&cp, 0, sizeof(cp)); 510 cp.handle = cpu_to_le16(conn->handle); 511 cp.conn_interval_min = cpu_to_le16(min); 512 cp.conn_interval_max = cpu_to_le16(max); 513 cp.conn_latency = cpu_to_le16(latency); 514 cp.supervision_timeout = cpu_to_le16(to_multiplier); 515 cp.min_ce_len = cpu_to_le16(0x0000); 516 cp.max_ce_len = cpu_to_le16(0x0000); 517 518 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp); 519 520 if (params) 521 return 0x01; 522 523 return 0x00; 524 } 525 526 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand, 527 __u8 ltk[16], __u8 key_size) 528 { 529 struct hci_dev *hdev = conn->hdev; 530 struct hci_cp_le_start_enc cp; 531 532 BT_DBG("hcon %p", conn); 533 534 memset(&cp, 0, sizeof(cp)); 535 536 cp.handle = cpu_to_le16(conn->handle); 537 cp.rand = rand; 538 cp.ediv = ediv; 539 memcpy(cp.ltk, ltk, key_size); 540 541 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp); 542 } 543 544 /* Device _must_ be locked */ 545 void hci_sco_setup(struct hci_conn *conn, __u8 status) 546 { 547 struct hci_conn *sco = conn->link; 548 549 if (!sco) 550 return; 551 552 BT_DBG("hcon %p", conn); 553 554 if (!status) { 555 if (lmp_esco_capable(conn->hdev)) 556 hci_setup_sync(sco, conn->handle); 557 else 558 hci_add_sco(sco, conn->handle); 559 } else { 560 hci_connect_cfm(sco, status); 561 hci_conn_del(sco); 562 } 563 } 564 565 static void hci_conn_timeout(struct work_struct *work) 566 { 567 struct hci_conn *conn = container_of(work, struct hci_conn, 568 disc_work.work); 569 int refcnt = atomic_read(&conn->refcnt); 570 571 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state)); 572 573 WARN_ON(refcnt < 0); 574 575 /* FIXME: It was observed that in pairing failed scenario, refcnt 576 * drops below 0. Probably this is because l2cap_conn_del calls 577 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is 578 * dropped. After that loop hci_chan_del is called which also drops 579 * conn. For now make sure that ACL is alive if refcnt is higher then 0, 580 * otherwise drop it. 581 */ 582 if (refcnt > 0) 583 return; 584 585 /* LE connections in scanning state need special handling */ 586 if (conn->state == BT_CONNECT && conn->type == LE_LINK && 587 test_bit(HCI_CONN_SCANNING, &conn->flags)) { 588 hci_connect_le_scan_remove(conn); 589 return; 590 } 591 592 hci_abort_conn(conn, hci_proto_disconn_ind(conn)); 593 } 594 595 /* Enter sniff mode */ 596 static void hci_conn_idle(struct work_struct *work) 597 { 598 struct hci_conn *conn = container_of(work, struct hci_conn, 599 idle_work.work); 600 struct hci_dev *hdev = conn->hdev; 601 602 BT_DBG("hcon %p mode %d", conn, conn->mode); 603 604 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn)) 605 return; 606 607 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF)) 608 return; 609 610 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) { 611 struct hci_cp_sniff_subrate cp; 612 cp.handle = cpu_to_le16(conn->handle); 613 cp.max_latency = cpu_to_le16(0); 614 cp.min_remote_timeout = cpu_to_le16(0); 615 cp.min_local_timeout = cpu_to_le16(0); 616 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp); 617 } 618 619 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) { 620 struct hci_cp_sniff_mode cp; 621 cp.handle = cpu_to_le16(conn->handle); 622 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval); 623 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval); 624 cp.attempt = cpu_to_le16(4); 625 cp.timeout = cpu_to_le16(1); 626 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp); 627 } 628 } 629 630 static void hci_conn_auto_accept(struct work_struct *work) 631 { 632 struct hci_conn *conn = container_of(work, struct hci_conn, 633 auto_accept_work.work); 634 635 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst), 636 &conn->dst); 637 } 638 639 static void le_disable_advertising(struct hci_dev *hdev) 640 { 641 if (ext_adv_capable(hdev)) { 642 struct hci_cp_le_set_ext_adv_enable cp; 643 644 cp.enable = 0x00; 645 cp.num_of_sets = 0x00; 646 647 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp), 648 &cp); 649 } else { 650 u8 enable = 0x00; 651 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), 652 &enable); 653 } 654 } 655 656 static void le_conn_timeout(struct work_struct *work) 657 { 658 struct hci_conn *conn = container_of(work, struct hci_conn, 659 le_conn_timeout.work); 660 struct hci_dev *hdev = conn->hdev; 661 662 BT_DBG(""); 663 664 /* We could end up here due to having done directed advertising, 665 * so clean up the state if necessary. This should however only 666 * happen with broken hardware or if low duty cycle was used 667 * (which doesn't have a timeout of its own). 668 */ 669 if (conn->role == HCI_ROLE_SLAVE) { 670 /* Disable LE Advertising */ 671 le_disable_advertising(hdev); 672 hci_dev_lock(hdev); 673 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT); 674 hci_dev_unlock(hdev); 675 return; 676 } 677 678 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM); 679 } 680 681 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst, 682 u8 role) 683 { 684 struct hci_conn *conn; 685 686 BT_DBG("%s dst %pMR", hdev->name, dst); 687 688 conn = kzalloc(sizeof(*conn), GFP_KERNEL); 689 if (!conn) 690 return NULL; 691 692 bacpy(&conn->dst, dst); 693 bacpy(&conn->src, &hdev->bdaddr); 694 conn->handle = HCI_CONN_HANDLE_UNSET; 695 conn->hdev = hdev; 696 conn->type = type; 697 conn->role = role; 698 conn->mode = HCI_CM_ACTIVE; 699 conn->state = BT_OPEN; 700 conn->auth_type = HCI_AT_GENERAL_BONDING; 701 conn->io_capability = hdev->io_capability; 702 conn->remote_auth = 0xff; 703 conn->key_type = 0xff; 704 conn->rssi = HCI_RSSI_INVALID; 705 conn->tx_power = HCI_TX_POWER_INVALID; 706 conn->max_tx_power = HCI_TX_POWER_INVALID; 707 708 set_bit(HCI_CONN_POWER_SAVE, &conn->flags); 709 conn->disc_timeout = HCI_DISCONN_TIMEOUT; 710 711 /* Set Default Authenticated payload timeout to 30s */ 712 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT; 713 714 if (conn->role == HCI_ROLE_MASTER) 715 conn->out = true; 716 717 switch (type) { 718 case ACL_LINK: 719 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK; 720 break; 721 case LE_LINK: 722 /* conn->src should reflect the local identity address */ 723 hci_copy_identity_address(hdev, &conn->src, &conn->src_type); 724 break; 725 case SCO_LINK: 726 if (lmp_esco_capable(hdev)) 727 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) | 728 (hdev->esco_type & EDR_ESCO_MASK); 729 else 730 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK; 731 break; 732 case ESCO_LINK: 733 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK; 734 break; 735 } 736 737 skb_queue_head_init(&conn->data_q); 738 739 INIT_LIST_HEAD(&conn->chan_list); 740 741 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout); 742 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept); 743 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle); 744 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout); 745 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup); 746 747 atomic_set(&conn->refcnt, 0); 748 749 hci_dev_hold(hdev); 750 751 hci_conn_hash_add(hdev, conn); 752 753 /* The SCO and eSCO connections will only be notified when their 754 * setup has been completed. This is different to ACL links which 755 * can be notified right away. 756 */ 757 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) { 758 if (hdev->notify) 759 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD); 760 } 761 762 hci_conn_init_sysfs(conn); 763 764 return conn; 765 } 766 767 int hci_conn_del(struct hci_conn *conn) 768 { 769 struct hci_dev *hdev = conn->hdev; 770 771 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle); 772 773 cancel_delayed_work_sync(&conn->disc_work); 774 cancel_delayed_work_sync(&conn->auto_accept_work); 775 cancel_delayed_work_sync(&conn->idle_work); 776 777 if (conn->type == ACL_LINK) { 778 struct hci_conn *sco = conn->link; 779 if (sco) 780 sco->link = NULL; 781 782 /* Unacked frames */ 783 hdev->acl_cnt += conn->sent; 784 } else if (conn->type == LE_LINK) { 785 cancel_delayed_work(&conn->le_conn_timeout); 786 787 if (hdev->le_pkts) 788 hdev->le_cnt += conn->sent; 789 else 790 hdev->acl_cnt += conn->sent; 791 } else { 792 struct hci_conn *acl = conn->link; 793 if (acl) { 794 acl->link = NULL; 795 hci_conn_drop(acl); 796 } 797 } 798 799 if (conn->amp_mgr) 800 amp_mgr_put(conn->amp_mgr); 801 802 skb_queue_purge(&conn->data_q); 803 804 /* Remove the connection from the list and cleanup its remaining 805 * state. This is a separate function since for some cases like 806 * BT_CONNECT_SCAN we *only* want the cleanup part without the 807 * rest of hci_conn_del. 808 */ 809 hci_conn_cleanup(conn); 810 811 return 0; 812 } 813 814 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type) 815 { 816 int use_src = bacmp(src, BDADDR_ANY); 817 struct hci_dev *hdev = NULL, *d; 818 819 BT_DBG("%pMR -> %pMR", src, dst); 820 821 read_lock(&hci_dev_list_lock); 822 823 list_for_each_entry(d, &hci_dev_list, list) { 824 if (!test_bit(HCI_UP, &d->flags) || 825 hci_dev_test_flag(d, HCI_USER_CHANNEL) || 826 d->dev_type != HCI_PRIMARY) 827 continue; 828 829 /* Simple routing: 830 * No source address - find interface with bdaddr != dst 831 * Source address - find interface with bdaddr == src 832 */ 833 834 if (use_src) { 835 bdaddr_t id_addr; 836 u8 id_addr_type; 837 838 if (src_type == BDADDR_BREDR) { 839 if (!lmp_bredr_capable(d)) 840 continue; 841 bacpy(&id_addr, &d->bdaddr); 842 id_addr_type = BDADDR_BREDR; 843 } else { 844 if (!lmp_le_capable(d)) 845 continue; 846 847 hci_copy_identity_address(d, &id_addr, 848 &id_addr_type); 849 850 /* Convert from HCI to three-value type */ 851 if (id_addr_type == ADDR_LE_DEV_PUBLIC) 852 id_addr_type = BDADDR_LE_PUBLIC; 853 else 854 id_addr_type = BDADDR_LE_RANDOM; 855 } 856 857 if (!bacmp(&id_addr, src) && id_addr_type == src_type) { 858 hdev = d; break; 859 } 860 } else { 861 if (bacmp(&d->bdaddr, dst)) { 862 hdev = d; break; 863 } 864 } 865 } 866 867 if (hdev) 868 hdev = hci_dev_hold(hdev); 869 870 read_unlock(&hci_dev_list_lock); 871 return hdev; 872 } 873 EXPORT_SYMBOL(hci_get_route); 874 875 /* This function requires the caller holds hdev->lock */ 876 void hci_le_conn_failed(struct hci_conn *conn, u8 status) 877 { 878 struct hci_dev *hdev = conn->hdev; 879 struct hci_conn_params *params; 880 881 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst, 882 conn->dst_type); 883 if (params && params->conn) { 884 hci_conn_drop(params->conn); 885 hci_conn_put(params->conn); 886 params->conn = NULL; 887 } 888 889 conn->state = BT_CLOSED; 890 891 /* If the status indicates successful cancellation of 892 * the attempt (i.e. Unknown Connection Id) there's no point of 893 * notifying failure since we'll go back to keep trying to 894 * connect. The only exception is explicit connect requests 895 * where a timeout + cancel does indicate an actual failure. 896 */ 897 if (status != HCI_ERROR_UNKNOWN_CONN_ID || 898 (params && params->explicit_connect)) 899 mgmt_connect_failed(hdev, &conn->dst, conn->type, 900 conn->dst_type, status); 901 902 hci_connect_cfm(conn, status); 903 904 hci_conn_del(conn); 905 906 /* Since we may have temporarily stopped the background scanning in 907 * favor of connection establishment, we should restart it. 908 */ 909 hci_update_passive_scan(hdev); 910 911 /* Enable advertising in case this was a failed connection 912 * attempt as a peripheral. 913 */ 914 hci_enable_advertising(hdev); 915 } 916 917 static void create_le_conn_complete(struct hci_dev *hdev, void *data, int err) 918 { 919 struct hci_conn *conn = data; 920 921 hci_dev_lock(hdev); 922 923 if (!err) { 924 hci_connect_le_scan_cleanup(conn); 925 goto done; 926 } 927 928 bt_dev_err(hdev, "request failed to create LE connection: err %d", err); 929 930 if (!conn) 931 goto done; 932 933 hci_le_conn_failed(conn, err); 934 935 done: 936 hci_dev_unlock(hdev); 937 } 938 939 static int hci_connect_le_sync(struct hci_dev *hdev, void *data) 940 { 941 struct hci_conn *conn = data; 942 943 bt_dev_dbg(hdev, "conn %p", conn); 944 945 return hci_le_create_conn_sync(hdev, conn); 946 } 947 948 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst, 949 u8 dst_type, bool dst_resolved, u8 sec_level, 950 u16 conn_timeout, u8 role) 951 { 952 struct hci_conn *conn; 953 struct smp_irk *irk; 954 int err; 955 956 /* Let's make sure that le is enabled.*/ 957 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) { 958 if (lmp_le_capable(hdev)) 959 return ERR_PTR(-ECONNREFUSED); 960 961 return ERR_PTR(-EOPNOTSUPP); 962 } 963 964 /* Since the controller supports only one LE connection attempt at a 965 * time, we return -EBUSY if there is any connection attempt running. 966 */ 967 if (hci_lookup_le_connect(hdev)) 968 return ERR_PTR(-EBUSY); 969 970 /* If there's already a connection object but it's not in 971 * scanning state it means it must already be established, in 972 * which case we can't do anything else except report a failure 973 * to connect. 974 */ 975 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type); 976 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) { 977 return ERR_PTR(-EBUSY); 978 } 979 980 /* Check if the destination address has been resolved by the controller 981 * since if it did then the identity address shall be used. 982 */ 983 if (!dst_resolved) { 984 /* When given an identity address with existing identity 985 * resolving key, the connection needs to be established 986 * to a resolvable random address. 987 * 988 * Storing the resolvable random address is required here 989 * to handle connection failures. The address will later 990 * be resolved back into the original identity address 991 * from the connect request. 992 */ 993 irk = hci_find_irk_by_addr(hdev, dst, dst_type); 994 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) { 995 dst = &irk->rpa; 996 dst_type = ADDR_LE_DEV_RANDOM; 997 } 998 } 999 1000 if (conn) { 1001 bacpy(&conn->dst, dst); 1002 } else { 1003 conn = hci_conn_add(hdev, LE_LINK, dst, role); 1004 if (!conn) 1005 return ERR_PTR(-ENOMEM); 1006 hci_conn_hold(conn); 1007 conn->pending_sec_level = sec_level; 1008 } 1009 1010 conn->dst_type = dst_type; 1011 conn->sec_level = BT_SECURITY_LOW; 1012 conn->conn_timeout = conn_timeout; 1013 1014 conn->state = BT_CONNECT; 1015 clear_bit(HCI_CONN_SCANNING, &conn->flags); 1016 1017 err = hci_cmd_sync_queue(hdev, hci_connect_le_sync, conn, 1018 create_le_conn_complete); 1019 if (err) { 1020 hci_conn_del(conn); 1021 return ERR_PTR(err); 1022 } 1023 1024 return conn; 1025 } 1026 1027 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type) 1028 { 1029 struct hci_conn *conn; 1030 1031 conn = hci_conn_hash_lookup_le(hdev, addr, type); 1032 if (!conn) 1033 return false; 1034 1035 if (conn->state != BT_CONNECTED) 1036 return false; 1037 1038 return true; 1039 } 1040 1041 /* This function requires the caller holds hdev->lock */ 1042 static int hci_explicit_conn_params_set(struct hci_dev *hdev, 1043 bdaddr_t *addr, u8 addr_type) 1044 { 1045 struct hci_conn_params *params; 1046 1047 if (is_connected(hdev, addr, addr_type)) 1048 return -EISCONN; 1049 1050 params = hci_conn_params_lookup(hdev, addr, addr_type); 1051 if (!params) { 1052 params = hci_conn_params_add(hdev, addr, addr_type); 1053 if (!params) 1054 return -ENOMEM; 1055 1056 /* If we created new params, mark them to be deleted in 1057 * hci_connect_le_scan_cleanup. It's different case than 1058 * existing disabled params, those will stay after cleanup. 1059 */ 1060 params->auto_connect = HCI_AUTO_CONN_EXPLICIT; 1061 } 1062 1063 /* We're trying to connect, so make sure params are at pend_le_conns */ 1064 if (params->auto_connect == HCI_AUTO_CONN_DISABLED || 1065 params->auto_connect == HCI_AUTO_CONN_REPORT || 1066 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) { 1067 list_del_init(¶ms->action); 1068 list_add(¶ms->action, &hdev->pend_le_conns); 1069 } 1070 1071 params->explicit_connect = true; 1072 1073 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type, 1074 params->auto_connect); 1075 1076 return 0; 1077 } 1078 1079 /* This function requires the caller holds hdev->lock */ 1080 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst, 1081 u8 dst_type, u8 sec_level, 1082 u16 conn_timeout, 1083 enum conn_reasons conn_reason) 1084 { 1085 struct hci_conn *conn; 1086 1087 /* Let's make sure that le is enabled.*/ 1088 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) { 1089 if (lmp_le_capable(hdev)) 1090 return ERR_PTR(-ECONNREFUSED); 1091 1092 return ERR_PTR(-EOPNOTSUPP); 1093 } 1094 1095 /* Some devices send ATT messages as soon as the physical link is 1096 * established. To be able to handle these ATT messages, the user- 1097 * space first establishes the connection and then starts the pairing 1098 * process. 1099 * 1100 * So if a hci_conn object already exists for the following connection 1101 * attempt, we simply update pending_sec_level and auth_type fields 1102 * and return the object found. 1103 */ 1104 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type); 1105 if (conn) { 1106 if (conn->pending_sec_level < sec_level) 1107 conn->pending_sec_level = sec_level; 1108 goto done; 1109 } 1110 1111 BT_DBG("requesting refresh of dst_addr"); 1112 1113 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER); 1114 if (!conn) 1115 return ERR_PTR(-ENOMEM); 1116 1117 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) { 1118 hci_conn_del(conn); 1119 return ERR_PTR(-EBUSY); 1120 } 1121 1122 conn->state = BT_CONNECT; 1123 set_bit(HCI_CONN_SCANNING, &conn->flags); 1124 conn->dst_type = dst_type; 1125 conn->sec_level = BT_SECURITY_LOW; 1126 conn->pending_sec_level = sec_level; 1127 conn->conn_timeout = conn_timeout; 1128 conn->conn_reason = conn_reason; 1129 1130 hci_update_passive_scan(hdev); 1131 1132 done: 1133 hci_conn_hold(conn); 1134 return conn; 1135 } 1136 1137 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst, 1138 u8 sec_level, u8 auth_type, 1139 enum conn_reasons conn_reason) 1140 { 1141 struct hci_conn *acl; 1142 1143 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) { 1144 if (lmp_bredr_capable(hdev)) 1145 return ERR_PTR(-ECONNREFUSED); 1146 1147 return ERR_PTR(-EOPNOTSUPP); 1148 } 1149 1150 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst); 1151 if (!acl) { 1152 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER); 1153 if (!acl) 1154 return ERR_PTR(-ENOMEM); 1155 } 1156 1157 hci_conn_hold(acl); 1158 1159 acl->conn_reason = conn_reason; 1160 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) { 1161 acl->sec_level = BT_SECURITY_LOW; 1162 acl->pending_sec_level = sec_level; 1163 acl->auth_type = auth_type; 1164 hci_acl_create_connection(acl); 1165 } 1166 1167 return acl; 1168 } 1169 1170 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst, 1171 __u16 setting, struct bt_codec *codec) 1172 { 1173 struct hci_conn *acl; 1174 struct hci_conn *sco; 1175 1176 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING, 1177 CONN_REASON_SCO_CONNECT); 1178 if (IS_ERR(acl)) 1179 return acl; 1180 1181 sco = hci_conn_hash_lookup_ba(hdev, type, dst); 1182 if (!sco) { 1183 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER); 1184 if (!sco) { 1185 hci_conn_drop(acl); 1186 return ERR_PTR(-ENOMEM); 1187 } 1188 } 1189 1190 acl->link = sco; 1191 sco->link = acl; 1192 1193 hci_conn_hold(sco); 1194 1195 sco->setting = setting; 1196 sco->codec = *codec; 1197 1198 if (acl->state == BT_CONNECTED && 1199 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) { 1200 set_bit(HCI_CONN_POWER_SAVE, &acl->flags); 1201 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON); 1202 1203 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) { 1204 /* defer SCO setup until mode change completed */ 1205 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags); 1206 return sco; 1207 } 1208 1209 hci_sco_setup(acl, 0x00); 1210 } 1211 1212 return sco; 1213 } 1214 1215 /* Check link security requirement */ 1216 int hci_conn_check_link_mode(struct hci_conn *conn) 1217 { 1218 BT_DBG("hcon %p", conn); 1219 1220 /* In Secure Connections Only mode, it is required that Secure 1221 * Connections is used and the link is encrypted with AES-CCM 1222 * using a P-256 authenticated combination key. 1223 */ 1224 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) { 1225 if (!hci_conn_sc_enabled(conn) || 1226 !test_bit(HCI_CONN_AES_CCM, &conn->flags) || 1227 conn->key_type != HCI_LK_AUTH_COMBINATION_P256) 1228 return 0; 1229 } 1230 1231 /* AES encryption is required for Level 4: 1232 * 1233 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C 1234 * page 1319: 1235 * 1236 * 128-bit equivalent strength for link and encryption keys 1237 * required using FIPS approved algorithms (E0 not allowed, 1238 * SAFER+ not allowed, and P-192 not allowed; encryption key 1239 * not shortened) 1240 */ 1241 if (conn->sec_level == BT_SECURITY_FIPS && 1242 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) { 1243 bt_dev_err(conn->hdev, 1244 "Invalid security: Missing AES-CCM usage"); 1245 return 0; 1246 } 1247 1248 if (hci_conn_ssp_enabled(conn) && 1249 !test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 1250 return 0; 1251 1252 return 1; 1253 } 1254 1255 /* Authenticate remote device */ 1256 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type) 1257 { 1258 BT_DBG("hcon %p", conn); 1259 1260 if (conn->pending_sec_level > sec_level) 1261 sec_level = conn->pending_sec_level; 1262 1263 if (sec_level > conn->sec_level) 1264 conn->pending_sec_level = sec_level; 1265 else if (test_bit(HCI_CONN_AUTH, &conn->flags)) 1266 return 1; 1267 1268 /* Make sure we preserve an existing MITM requirement*/ 1269 auth_type |= (conn->auth_type & 0x01); 1270 1271 conn->auth_type = auth_type; 1272 1273 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) { 1274 struct hci_cp_auth_requested cp; 1275 1276 cp.handle = cpu_to_le16(conn->handle); 1277 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED, 1278 sizeof(cp), &cp); 1279 1280 /* If we're already encrypted set the REAUTH_PEND flag, 1281 * otherwise set the ENCRYPT_PEND. 1282 */ 1283 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 1284 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags); 1285 else 1286 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags); 1287 } 1288 1289 return 0; 1290 } 1291 1292 /* Encrypt the link */ 1293 static void hci_conn_encrypt(struct hci_conn *conn) 1294 { 1295 BT_DBG("hcon %p", conn); 1296 1297 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) { 1298 struct hci_cp_set_conn_encrypt cp; 1299 cp.handle = cpu_to_le16(conn->handle); 1300 cp.encrypt = 0x01; 1301 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp), 1302 &cp); 1303 } 1304 } 1305 1306 /* Enable security */ 1307 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type, 1308 bool initiator) 1309 { 1310 BT_DBG("hcon %p", conn); 1311 1312 if (conn->type == LE_LINK) 1313 return smp_conn_security(conn, sec_level); 1314 1315 /* For sdp we don't need the link key. */ 1316 if (sec_level == BT_SECURITY_SDP) 1317 return 1; 1318 1319 /* For non 2.1 devices and low security level we don't need the link 1320 key. */ 1321 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn)) 1322 return 1; 1323 1324 /* For other security levels we need the link key. */ 1325 if (!test_bit(HCI_CONN_AUTH, &conn->flags)) 1326 goto auth; 1327 1328 /* An authenticated FIPS approved combination key has sufficient 1329 * security for security level 4. */ 1330 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 && 1331 sec_level == BT_SECURITY_FIPS) 1332 goto encrypt; 1333 1334 /* An authenticated combination key has sufficient security for 1335 security level 3. */ 1336 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 || 1337 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) && 1338 sec_level == BT_SECURITY_HIGH) 1339 goto encrypt; 1340 1341 /* An unauthenticated combination key has sufficient security for 1342 security level 1 and 2. */ 1343 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 || 1344 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) && 1345 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW)) 1346 goto encrypt; 1347 1348 /* A combination key has always sufficient security for the security 1349 levels 1 or 2. High security level requires the combination key 1350 is generated using maximum PIN code length (16). 1351 For pre 2.1 units. */ 1352 if (conn->key_type == HCI_LK_COMBINATION && 1353 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW || 1354 conn->pin_length == 16)) 1355 goto encrypt; 1356 1357 auth: 1358 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) 1359 return 0; 1360 1361 if (initiator) 1362 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags); 1363 1364 if (!hci_conn_auth(conn, sec_level, auth_type)) 1365 return 0; 1366 1367 encrypt: 1368 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) { 1369 /* Ensure that the encryption key size has been read, 1370 * otherwise stall the upper layer responses. 1371 */ 1372 if (!conn->enc_key_size) 1373 return 0; 1374 1375 /* Nothing else needed, all requirements are met */ 1376 return 1; 1377 } 1378 1379 hci_conn_encrypt(conn); 1380 return 0; 1381 } 1382 EXPORT_SYMBOL(hci_conn_security); 1383 1384 /* Check secure link requirement */ 1385 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level) 1386 { 1387 BT_DBG("hcon %p", conn); 1388 1389 /* Accept if non-secure or higher security level is required */ 1390 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS) 1391 return 1; 1392 1393 /* Accept if secure or higher security level is already present */ 1394 if (conn->sec_level == BT_SECURITY_HIGH || 1395 conn->sec_level == BT_SECURITY_FIPS) 1396 return 1; 1397 1398 /* Reject not secure link */ 1399 return 0; 1400 } 1401 EXPORT_SYMBOL(hci_conn_check_secure); 1402 1403 /* Switch role */ 1404 int hci_conn_switch_role(struct hci_conn *conn, __u8 role) 1405 { 1406 BT_DBG("hcon %p", conn); 1407 1408 if (role == conn->role) 1409 return 1; 1410 1411 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) { 1412 struct hci_cp_switch_role cp; 1413 bacpy(&cp.bdaddr, &conn->dst); 1414 cp.role = role; 1415 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp); 1416 } 1417 1418 return 0; 1419 } 1420 EXPORT_SYMBOL(hci_conn_switch_role); 1421 1422 /* Enter active mode */ 1423 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active) 1424 { 1425 struct hci_dev *hdev = conn->hdev; 1426 1427 BT_DBG("hcon %p mode %d", conn, conn->mode); 1428 1429 if (conn->mode != HCI_CM_SNIFF) 1430 goto timer; 1431 1432 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active) 1433 goto timer; 1434 1435 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) { 1436 struct hci_cp_exit_sniff_mode cp; 1437 cp.handle = cpu_to_le16(conn->handle); 1438 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp); 1439 } 1440 1441 timer: 1442 if (hdev->idle_timeout > 0) 1443 queue_delayed_work(hdev->workqueue, &conn->idle_work, 1444 msecs_to_jiffies(hdev->idle_timeout)); 1445 } 1446 1447 /* Drop all connection on the device */ 1448 void hci_conn_hash_flush(struct hci_dev *hdev) 1449 { 1450 struct hci_conn_hash *h = &hdev->conn_hash; 1451 struct hci_conn *c, *n; 1452 1453 BT_DBG("hdev %s", hdev->name); 1454 1455 list_for_each_entry_safe(c, n, &h->list, list) { 1456 c->state = BT_CLOSED; 1457 1458 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM); 1459 hci_conn_del(c); 1460 } 1461 } 1462 1463 /* Check pending connect attempts */ 1464 void hci_conn_check_pending(struct hci_dev *hdev) 1465 { 1466 struct hci_conn *conn; 1467 1468 BT_DBG("hdev %s", hdev->name); 1469 1470 hci_dev_lock(hdev); 1471 1472 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2); 1473 if (conn) 1474 hci_acl_create_connection(conn); 1475 1476 hci_dev_unlock(hdev); 1477 } 1478 1479 static u32 get_link_mode(struct hci_conn *conn) 1480 { 1481 u32 link_mode = 0; 1482 1483 if (conn->role == HCI_ROLE_MASTER) 1484 link_mode |= HCI_LM_MASTER; 1485 1486 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 1487 link_mode |= HCI_LM_ENCRYPT; 1488 1489 if (test_bit(HCI_CONN_AUTH, &conn->flags)) 1490 link_mode |= HCI_LM_AUTH; 1491 1492 if (test_bit(HCI_CONN_SECURE, &conn->flags)) 1493 link_mode |= HCI_LM_SECURE; 1494 1495 if (test_bit(HCI_CONN_FIPS, &conn->flags)) 1496 link_mode |= HCI_LM_FIPS; 1497 1498 return link_mode; 1499 } 1500 1501 int hci_get_conn_list(void __user *arg) 1502 { 1503 struct hci_conn *c; 1504 struct hci_conn_list_req req, *cl; 1505 struct hci_conn_info *ci; 1506 struct hci_dev *hdev; 1507 int n = 0, size, err; 1508 1509 if (copy_from_user(&req, arg, sizeof(req))) 1510 return -EFAULT; 1511 1512 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci)) 1513 return -EINVAL; 1514 1515 size = sizeof(req) + req.conn_num * sizeof(*ci); 1516 1517 cl = kmalloc(size, GFP_KERNEL); 1518 if (!cl) 1519 return -ENOMEM; 1520 1521 hdev = hci_dev_get(req.dev_id); 1522 if (!hdev) { 1523 kfree(cl); 1524 return -ENODEV; 1525 } 1526 1527 ci = cl->conn_info; 1528 1529 hci_dev_lock(hdev); 1530 list_for_each_entry(c, &hdev->conn_hash.list, list) { 1531 bacpy(&(ci + n)->bdaddr, &c->dst); 1532 (ci + n)->handle = c->handle; 1533 (ci + n)->type = c->type; 1534 (ci + n)->out = c->out; 1535 (ci + n)->state = c->state; 1536 (ci + n)->link_mode = get_link_mode(c); 1537 if (++n >= req.conn_num) 1538 break; 1539 } 1540 hci_dev_unlock(hdev); 1541 1542 cl->dev_id = hdev->id; 1543 cl->conn_num = n; 1544 size = sizeof(req) + n * sizeof(*ci); 1545 1546 hci_dev_put(hdev); 1547 1548 err = copy_to_user(arg, cl, size); 1549 kfree(cl); 1550 1551 return err ? -EFAULT : 0; 1552 } 1553 1554 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg) 1555 { 1556 struct hci_conn_info_req req; 1557 struct hci_conn_info ci; 1558 struct hci_conn *conn; 1559 char __user *ptr = arg + sizeof(req); 1560 1561 if (copy_from_user(&req, arg, sizeof(req))) 1562 return -EFAULT; 1563 1564 hci_dev_lock(hdev); 1565 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr); 1566 if (conn) { 1567 bacpy(&ci.bdaddr, &conn->dst); 1568 ci.handle = conn->handle; 1569 ci.type = conn->type; 1570 ci.out = conn->out; 1571 ci.state = conn->state; 1572 ci.link_mode = get_link_mode(conn); 1573 } 1574 hci_dev_unlock(hdev); 1575 1576 if (!conn) 1577 return -ENOENT; 1578 1579 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0; 1580 } 1581 1582 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg) 1583 { 1584 struct hci_auth_info_req req; 1585 struct hci_conn *conn; 1586 1587 if (copy_from_user(&req, arg, sizeof(req))) 1588 return -EFAULT; 1589 1590 hci_dev_lock(hdev); 1591 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr); 1592 if (conn) 1593 req.type = conn->auth_type; 1594 hci_dev_unlock(hdev); 1595 1596 if (!conn) 1597 return -ENOENT; 1598 1599 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0; 1600 } 1601 1602 struct hci_chan *hci_chan_create(struct hci_conn *conn) 1603 { 1604 struct hci_dev *hdev = conn->hdev; 1605 struct hci_chan *chan; 1606 1607 BT_DBG("%s hcon %p", hdev->name, conn); 1608 1609 if (test_bit(HCI_CONN_DROP, &conn->flags)) { 1610 BT_DBG("Refusing to create new hci_chan"); 1611 return NULL; 1612 } 1613 1614 chan = kzalloc(sizeof(*chan), GFP_KERNEL); 1615 if (!chan) 1616 return NULL; 1617 1618 chan->conn = hci_conn_get(conn); 1619 skb_queue_head_init(&chan->data_q); 1620 chan->state = BT_CONNECTED; 1621 1622 list_add_rcu(&chan->list, &conn->chan_list); 1623 1624 return chan; 1625 } 1626 1627 void hci_chan_del(struct hci_chan *chan) 1628 { 1629 struct hci_conn *conn = chan->conn; 1630 struct hci_dev *hdev = conn->hdev; 1631 1632 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan); 1633 1634 list_del_rcu(&chan->list); 1635 1636 synchronize_rcu(); 1637 1638 /* Prevent new hci_chan's to be created for this hci_conn */ 1639 set_bit(HCI_CONN_DROP, &conn->flags); 1640 1641 hci_conn_put(conn); 1642 1643 skb_queue_purge(&chan->data_q); 1644 kfree(chan); 1645 } 1646 1647 void hci_chan_list_flush(struct hci_conn *conn) 1648 { 1649 struct hci_chan *chan, *n; 1650 1651 BT_DBG("hcon %p", conn); 1652 1653 list_for_each_entry_safe(chan, n, &conn->chan_list, list) 1654 hci_chan_del(chan); 1655 } 1656 1657 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon, 1658 __u16 handle) 1659 { 1660 struct hci_chan *hchan; 1661 1662 list_for_each_entry(hchan, &hcon->chan_list, list) { 1663 if (hchan->handle == handle) 1664 return hchan; 1665 } 1666 1667 return NULL; 1668 } 1669 1670 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle) 1671 { 1672 struct hci_conn_hash *h = &hdev->conn_hash; 1673 struct hci_conn *hcon; 1674 struct hci_chan *hchan = NULL; 1675 1676 rcu_read_lock(); 1677 1678 list_for_each_entry_rcu(hcon, &h->list, list) { 1679 hchan = __hci_chan_lookup_handle(hcon, handle); 1680 if (hchan) 1681 break; 1682 } 1683 1684 rcu_read_unlock(); 1685 1686 return hchan; 1687 } 1688 1689 u32 hci_conn_get_phy(struct hci_conn *conn) 1690 { 1691 u32 phys = 0; 1692 1693 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471: 1694 * Table 6.2: Packets defined for synchronous, asynchronous, and 1695 * CPB logical transport types. 1696 */ 1697 switch (conn->type) { 1698 case SCO_LINK: 1699 /* SCO logical transport (1 Mb/s): 1700 * HV1, HV2, HV3 and DV. 1701 */ 1702 phys |= BT_PHY_BR_1M_1SLOT; 1703 1704 break; 1705 1706 case ACL_LINK: 1707 /* ACL logical transport (1 Mb/s) ptt=0: 1708 * DH1, DM3, DH3, DM5 and DH5. 1709 */ 1710 phys |= BT_PHY_BR_1M_1SLOT; 1711 1712 if (conn->pkt_type & (HCI_DM3 | HCI_DH3)) 1713 phys |= BT_PHY_BR_1M_3SLOT; 1714 1715 if (conn->pkt_type & (HCI_DM5 | HCI_DH5)) 1716 phys |= BT_PHY_BR_1M_5SLOT; 1717 1718 /* ACL logical transport (2 Mb/s) ptt=1: 1719 * 2-DH1, 2-DH3 and 2-DH5. 1720 */ 1721 if (!(conn->pkt_type & HCI_2DH1)) 1722 phys |= BT_PHY_EDR_2M_1SLOT; 1723 1724 if (!(conn->pkt_type & HCI_2DH3)) 1725 phys |= BT_PHY_EDR_2M_3SLOT; 1726 1727 if (!(conn->pkt_type & HCI_2DH5)) 1728 phys |= BT_PHY_EDR_2M_5SLOT; 1729 1730 /* ACL logical transport (3 Mb/s) ptt=1: 1731 * 3-DH1, 3-DH3 and 3-DH5. 1732 */ 1733 if (!(conn->pkt_type & HCI_3DH1)) 1734 phys |= BT_PHY_EDR_3M_1SLOT; 1735 1736 if (!(conn->pkt_type & HCI_3DH3)) 1737 phys |= BT_PHY_EDR_3M_3SLOT; 1738 1739 if (!(conn->pkt_type & HCI_3DH5)) 1740 phys |= BT_PHY_EDR_3M_5SLOT; 1741 1742 break; 1743 1744 case ESCO_LINK: 1745 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */ 1746 phys |= BT_PHY_BR_1M_1SLOT; 1747 1748 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5))) 1749 phys |= BT_PHY_BR_1M_3SLOT; 1750 1751 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */ 1752 if (!(conn->pkt_type & ESCO_2EV3)) 1753 phys |= BT_PHY_EDR_2M_1SLOT; 1754 1755 if (!(conn->pkt_type & ESCO_2EV5)) 1756 phys |= BT_PHY_EDR_2M_3SLOT; 1757 1758 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */ 1759 if (!(conn->pkt_type & ESCO_3EV3)) 1760 phys |= BT_PHY_EDR_3M_1SLOT; 1761 1762 if (!(conn->pkt_type & ESCO_3EV5)) 1763 phys |= BT_PHY_EDR_3M_3SLOT; 1764 1765 break; 1766 1767 case LE_LINK: 1768 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M) 1769 phys |= BT_PHY_LE_1M_TX; 1770 1771 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M) 1772 phys |= BT_PHY_LE_1M_RX; 1773 1774 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M) 1775 phys |= BT_PHY_LE_2M_TX; 1776 1777 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M) 1778 phys |= BT_PHY_LE_2M_RX; 1779 1780 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED) 1781 phys |= BT_PHY_LE_CODED_TX; 1782 1783 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED) 1784 phys |= BT_PHY_LE_CODED_RX; 1785 1786 break; 1787 } 1788 1789 return phys; 1790 } 1791